#include<iostream>using namespace std;int main(){ int x,y; while(cin>>x>>y) { if(x==0&&y==0) { break; } int n; { for(n=x;n<=y;n++) { for(int i=2;i<n*n+n+41;i++) { if((n*n+n+41)%i!=0) { cout<<"YES"<<endl; break; } else { cout<<"NO"<<endl; } } } } } return 0; }